Disconnect the joining clamp between the two shafts before checking for play. Obviously you can check them better with the carbs on the bench. There should be NO play but realistically there will be just the tiniest movement. Any more than this then you will get unpredictable idle. If you can live with that that's fine, raising the idle to about 900/950 rpm helps. If you have a dynamo, setting the idle to have the charge light just flickering or just out is sensible. Bottom line, if the shafts have noticeable movement get them rebushed + new shafts. Shafts do wear and can be replaced. You might get lucky, but look on it as a short term fix.
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